sin(3p) - c7

1SIN(3P)                    POSIX Programmer's Manual                   SIN(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

12       sin, sinf, sinl - sine function
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SYNOPSIS

15       #include <math.h>
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17       double sin(double x);
18       float sinf(float x);
19       long double sinl(long double x);
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DESCRIPTION

23       These functions shall compute the sine of their argument x, measured in
24       radians.
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26       An  application  wishing to check for error situations should set errno
27       to zero and  call  feclearexcept(FE_ALL_EXCEPT)  before  calling  these
28       functions.   On return, if errno is non-zero or fetestexcept(FE_INVALID
29       | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero, an error  has
30       occurred.
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RETURN VALUE

33       Upon successful completion, these functions shall return the sine of x.
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35       If x is NaN, a NaN shall be returned.
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37       If x is ±0, x shall be returned.
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39       If x is subnormal, a range error may occur and x should be returned.
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41       If  x  is  ±Inf,  a domain error shall occur, and either a NaN (if sup‐
42       ported), or an implementation-defined value shall be returned.
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ERRORS

45       These functions shall fail if:
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47       Domain Error
48              The x argument is ±Inf.
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50       If the integer expression (math_errhandling & MATH_ERRNO) is  non-zero,
51       then   errno  shall  be  set  to  [EDOM].  If  the  integer  expression
52       (math_errhandling &  MATH_ERREXCEPT)  is  non-zero,  then  the  invalid
53       floating-point exception shall be raised.
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56       These functions may fail if:
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58       Range Error
59              The value of x is subnormal
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61       If  the integer expression (math_errhandling & MATH_ERRNO) is non-zero,
62       then errno  shall  be  set  to  [ERANGE].  If  the  integer  expression
63       (math_errhandling  &  MATH_ERREXCEPT)  is  non-zero, then the underflow
64       floating-point exception shall be raised.
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67       The following sections are informative.
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EXAMPLES

70   Taking the Sine of a 45-Degree Angle
71              #include <math.h>
72              ...
73              double radians = 45.0 * M_PI / 180;
74              double result;
75              ...
76              result = sin(radians);
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APPLICATION USAGE

79       These functions may lose accuracy when their argument is near a  multi‐
80       ple of pi or is far from 0.0.
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82       On   error,   the   expressions  (math_errhandling  &  MATH_ERRNO)  and
83       (math_errhandling & MATH_ERREXCEPT) are independent of each other,  but
84       at least one of them must be non-zero.
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RATIONALE

87       None.
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FUTURE DIRECTIONS

90       None.
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COPYRIGHT

98       Portions  of  this text are reprinted and reproduced in electronic form
99       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
100       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
101       Specifications Issue 6, Copyright (C) 2001-2003  by  the  Institute  of
102       Electrical  and  Electronics  Engineers, Inc and The Open Group. In the
103       event of any discrepancy between this version and the original IEEE and
104       The  Open Group Standard, the original IEEE and The Open Group Standard
105       is the referee document. The original Standard can be  obtained  online
106       at http://www.opengroup.org/unix/online.html .
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110IEEE/The Open Group                  2003                              SIN(3P)